Panasonic NN-CT890SBPQ, Service Manual

Page: 32 / 45

NN-CT890SBPQ
32
12 Measurements and Adjustments
Warning
• For continued protection against radiation hazard, replace
only with identical parts.
• When the 10 amp fuse is blown due to the operation of the
short switch, you must replace the primary latch switch and
short switch. Then follow the installation procedures below.
• Interlock switch replacement - In replacing faulty switches,
be sure mounting tabs are not bent, broken or otherwise
deficient in their ability to hold the switches.
• Refer to the schematic and wiring diagram to ensure proper
connection
12.1. Installation of primary latch
switch, secondary latch switch
and short switch.
1. When mounting the primary latch switch, secondary latch
switch and short switch to the door hook assembly. Fol-
low the instructions in figure 1.
NOTE: No specific adjustment during the installation of
each switch into the door hook is necessary.
2. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving it in
the direction of the arrow in figure 1. Ensuring the door
does not have any play in it. Check for play by pulling the
door assembly. Make sure that the latch keys move
smoothly after adjustment is completed. Completely
tighten the screws holding the door hook assembly to the
oven assembly.
3. Reconnect the short switch, primary switch and second-
ary latch switches and check the continuity of the monitor
circuit and latch switches by following the component test
procedures on page 29.
12.2. Measurement of microwave
output
The output power of the magnetron can be determined by per-
forming the IEC standard test. However, due to the complexity
of the IEC test procedures, it is recommended to test the mag-
netron using the simple method outlined below.
Necessary equipment:
• 1 litre beaker
• Glass thermometer
• Wrist watch or stop watch
NOTE: Check the line voltage under load. Low voltage will
lower the magnetron output. Take the temperature readings
and heating time as accurate as possible.
1. Fill the beaker with exactly one litre of tap water. Stir the
water using the thermometer and record the beakers tem-
perature (Recorded as T1)
2. Place the beaker on the center of the glass cook plate.
3. Set the microwave on micro power, high for 1 minute. Stir
the water again and read the temperature of the beaker
(Recorded as T2)
4. The approximate normal temperature rise at the high
power position for each model is shown in the table. (Fig-
ure 2)
Adjustment of latch switch assembly
Figure 1
TABLE (1L - 1min test)
Figure
2
RATED OUTPUT Approximate temperature
rise T2-T1
1000W 14
°
C